This product is FINAL SALE, No Exchange, No Return.
Size: Approx 3.7cm (1.4inch).
Features: Replacement, Anti Haze, Accessories.
Application: Applicable to most kind of double air breathing valve . Suitable for sports , running , active carbon , etc..
The Way to Use:
1. Open the to expose the interior of the filter valve.
2. According to the OPEN directions on the valve, turn the valve counter(clockwise), to separate the valve. Remove the filter.
3. Replace the new filter, reverse the above steps, clockwise rotation of the valve, over.